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I agree with you, as a matter of fact, properly torqued, there is no need for any other "locking" device, lock washer, nylock or self locking nut, the assembly with stay together by the tension in the cap screw. All surfaces must be clean, though.
"Grade 8 fine thread with nylock nuts" reads like an odd combination. Are you sure that those nylock nuts are grade 8? If not, the threads will be stripped out when torqued to spec.
I would use selflocking grade 8 nuts with those screws.
Just a humble observation...
Don't think I have ever seen...